• Released Friday, March 3rd, 2017
  • Updated Friday, February 23rd, 2024 at 12:00AM


The Neutron star Interior Composition Explorer

Installed aboard the International Space Station in June 2017, NASA’s Neutron star Interior Composition Explorer provides high-precision measurements of neutron stars, objects containing ultra-dense matter at the threshold of collapse into black holes. NICER will also test, for the first time in space, technology that uses pulsars as navigation beacons.

For more information visit the NICER website.

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SEXTANT Demonstration

NICER is a two-in-one mission. In addition to its cutting-edge astrophysics investigations, the embedded Station Explorer for X-ray Timing and Navigation Technology (SEXTANT) component will demonstrate a technological first: real-time, autonomous spacecraft navigation using pulsars as beacons.

For more information, visit the SEXTANT website.

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